cleanup custom error types

[ts0yu]

boom

[codecov]

Codecov Report

Merging #434 (9c798a2) into main (12e06ee) will increase coverage by 0.41%.
Report is 1 commits behind head on main.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #434      +/-   ##
==========================================
+ Coverage   57.82%   58.24%   +0.41%     
==========================================
  Files          10       10              
  Lines        3028     2996      -32     
==========================================
- Hits         1751     1745       -6     
+ Misses       1277     1251      -26     

Files Changed	Coverage Δ
arbiter-core/src/manager.rs	61.11% <0.00%> (+2.77%)	⬆️
arbiter-core/src/environment.rs	76.68% <39.13%> (+5.32%)	⬆️
arbiter-core/src/middleware.rs	84.52% <64.00%> (+1.14%)	⬆️

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[Autoparallel]

I'll review this in a bit! Looking clean though 😁

[0xJepsen]

this looks good to me! If you could bump the patch version i think we can get this moved in!

[Autoparallel]

looks great!

[Autoparallel]

@0xJepsen I bumped the arbiter-core patch since that was all that was touched. Feel free to review/merge.